Method for implementing full digital wireless communication system using fast Fourier transform

A technology of wireless communication system and Fourier transform, which is applied in the field of realizing all-digital wireless communication system by using fast Fourier transform, which can solve the problem of increasing the complexity, cost and power consumption of the system, affecting the flexibility of the spectrum used by the system, and the central frequency cannot be arbitrarily Changes and other issues to achieve the effect of convenient adaptive spectrum shifting, avoiding noise and phase imbalance, and reducing the amount of calculation

Inactive Publication Date: 2005-04-13
南京市物联网与集成电路设计产业创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using such a method, the system needs to use an analog carrier modulator and demodulator, which increases the complexity, cost and power consumption of the system implementation, and the introduction of noise and phase imbalance in the analog modulation will also affect the system performance. performance
At the same time, parameters such as the center frequency of analog modulation and demodulator cannot be changed at will, which affects the flexibility of the system to use spectrum

Method used

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  • Method for implementing full digital wireless communication system using fast Fourier transform
  • Method for implementing full digital wireless communication system using fast Fourier transform
  • Method for implementing full digital wireless communication system using fast Fourier transform

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Embodiment 1

[0036] A method for realizing an all-digital wireless communication system using fast Fourier transform applied to medium and high-speed wireless communication systems, including a transmitting method and a receiving method, characterized in that: at the transmitting end, the transmitted data 1 adopts packet-based burst Structure, the front end of each data packet is packet detection, synchronization sequence and channel estimation sequence, used for packet detection, symbol synchronization and channel estimation: each data packet is first encoded by channel encoder 2, and added for checksum Redundant information for error correction; channel interleaving 3 is performed after channel coding to reduce the impact of burst errors in channel transmission on performance; the output bit stream of channel interleaving passes through the symbol mapper 4 to form a symbol stream that can be used for transmission; then perform Serial-to-parallel conversion 5 converts the serial symbol str...

Embodiment 2

[0051] An ultra-wideband wireless communication system designed according to the present invention is used as a reference design for a specific implementation. The basic parameters of this communication system are shown in Table 1. In the system, the subcarrier spacing of OFDM modulation is Δf=250KHz, and the number of subcarriers is N=128, where N D = 112 subcarriers transmit data. The input to the IFFT takes the form of the inverse complex conjugate. The frequency spectrum of the baseband signal is shifted by "8×128 point quadrature modulation" (ie, P=8, N=128). Adaptive algorithms for spectrum control are not included in this example, k 0 Take a fixed value of 448. In this way, in P×N=1024 point IFFT, the subcarrier sequence numbers occupied by valid data are 448-575, and the baseband signal is moved to [(k 0 -1 / 2)Δf, (k 0 +N-1 / 2)Δf], that is, within the frequency band of 111.875-143.875MHz.

[0052] parameters

value

Subcarrier spacing Δf

250KH...

Embodiment 3

[0061] The present invention adopts Orthogonal Frequency Division Multiplexing (OFDM) coding and modulation technology in the baseband, and utilizes FFT / IFFT to realize the spectrum shift of the baseband ultra-wideband signal, thereby realizing an all-digital ultra-wideband wireless communication system.

[0062] The principle block diagram of the all-digital ultra-wideband wireless communication system proposed by the present invention is shown in FIG. 1 . At the transmitter, send data 1 Packet-based burst structure is adopted to meet the requirements of flexible use of transmission resources for high-speed wireless multimedia communication. As shown in Figure 2, the front end of each data packet is a packet detection, synchronization sequence and channel estimation sequence, which are used for packet detection, symbol synchronization and channel estimation. The channel estimation sequence is followed by the data portion to be transmitted. Each packet first passes through t...

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Abstract

A method for realizing total digital wireless communication system utilizing quick Fourier conversion is that at the emit end, the transmitted data is in the structure of burst based on packets to form a symbol stream used in transmission by channel encoding, channel interlace and symbol image device and to turn the serial into the parallel as the input of orthogonal modulator which caries out P times orthogonal modulation to each set N point input symbol sequence in the following steps: carrying out frequency domain phase rotation to the input N points symbol sequence, quickly inverting the Fourier conversion then to rotate the time domain phase, regulate the sequence via parallel/serial conversion, adding circulation prefix and modules converter to be emitted, at the receive end, signals received by the antenna are turned to output data by modules conversion, serial/parallel conversion and phase rotation N points quick Fourier conversion, channel estimation frequency balance, parallel/serial conversion, symbol inversed image channel de-interlace and channel decode.

Description

technical field [0001] The present invention is a solution applied to medium and high-speed wireless communication systems to realize the physical layer of all-digital broadband, ultra-wideband medium and high-speed wireless communications, and in particular relates to a method for realizing a full-digital wireless communication system by using fast Fourier transform. Background technique [0002] Ultra-Wideband (UWB) technology is a revolutionary new technology in the field of wireless communication. UWB technology is characterized by using an extremely wide frequency band for communication, and can achieve a wireless transmission rate of more than 1000 Mbit / s. In order not to cause interference to other communication systems in the frequency band, the transmission power of the UWB system is strictly limited. Therefore, the current high-speed UWB communication distance is generally within 10 meters. [0003] At present, there are two basic impleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 张在琛毕光国
Owner 南京市物联网与集成电路设计产业创新中心有限公司
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